Method of rolling ribbed bars.



T. W. JENKS.

METHOD OF ROLLING RIBBED BARS.

APPLICATION FILED APR. 25,190'h Patented Nov. 30, 1909.

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T. W. JENKS.

METHOD OF ROLLING RIBBED BARS.

APPLICATION FILED APR.25,1907.

941,880. Patented Nov. 30, 1909.

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UNITED STATES PATENT OFFICE.

THOMAS W. JENKS, OF AVALON, PENNSYLVANIA.

METHOD OF ROLLING RIBBED BARS.

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To all whom it may concern:

Be it known that I, THOMAS W. JENKs, of Avalon, Allegheny county, Pennsylvania, have invented a new and useful Method of Rolling Ribbed Bars, of which the following is a full, clear, and exact description, reference being had to the accompanying drawlngs, forming part of this specification, in which- Figure 1 is a side elevation of a pair of rolls showing one set of passes arranged to carry out my invention; and Figs. 2, 8, a and 5 show successive sets of rolls containing a modified set of passes for carrying out my invention.

The invention relates to the rolling of ribbed bars, particularly those employed for reinforcing concrete wherein the bar is curved in cross-sectional contour, and is provided with longitudinal ribs.

It also relates more particularly to such a bar having cross ribs extending across the curved faces and connecting the longitudinal ribs. Special difliculty has been experienced in rolling such a bar with correctly curved faces, as it is diflicult to cause the metal to fill, especially in the upper portion of the last pass.

In carrying out my invention I take a billet of substantially rectangular cross-section, and feed it into a pass, such as shown at 2 in Fig. 1, this receiving the billet in a diagonal position. has a horizontal dimension greater than its vertical dimension, so that the billet as it passes through is reduced and flattened into a diamond or lozenge shape. In the next pass 3, the section is still further fiattcned into lozenge form, and rudimentary ribs 4 are formed at the opposite ends of the longest cross axis. The faces are also preferably slightly curved in this pass. In the next pass 5, the metal is given a more elliptical form in cross-section, the curves being more fully formed. In this case, the top and bottom faces are preferably in the form of a compound curve with the central portion a flattened relatively to the side portions 5, b which are on a curve of smaller radius. This has been found important in practice, in order that the top portions may fill the final pass. In the final pass 6, the metal is elongated, and narrowed onthe longer cross axis, so as to make substantially a round in cross-section. At the same time, the top and bottom ribs 7 are finally formed Specification of Letters Patent.

Application filed April 25, 1907.

This pass preferably Patented Nov. 30, 1909.

Serial No. 370,210.

from the rudimentary ribs 4 by suitable grooves in the rolls, intervening ribs 7 being also formed in the same manner as ribs 4, and if cross ribs are desired, these are formed in this last pass, as indicated by the dotted lines 0. These cross ribs preferably extend between the longitudinal ribs 7 and 7 and preferably alternate with each other. The metal is inserted in the last pass with its greatest cross-sectional axis in a horizontal direction. In this form the square is therefore rolled into a wider fiat with rounded edges and ribs. This fiat is rolled into the compound elliptical form, and is then formed into the shape proper.

In Fig. 1, I have shown the passes as formed in the same set of rolls 8 and 9 of a reversing mill.

The passes may be formed in separate sets of rolls whether arranged in tandem or not; and I show such a form in Figs. 2 to 5, inclusive. In these figures, 2 is the first pass formed between the rolls 10 and 11, and corresponding to the first pass of Fig. 1. Fig. 3 shows the second pass 3 in which the metal is flattened and provided with ribs 4 this pass being formed in the rolls 12 and 13. In Fig. 4:, I show the third pass which in this case is an edging pass 5; that is the metal is turned to an angle of 90 degrees from its position in the second pass, so as to bring its greatest dimension in a vertical position. In this case also I preferably begin to form the other two longitudinal ribs 7 on the flattened sides, the ribs 41 still remaining and being brought into vertical position over each other. The pass 5 is shown as formed in the rolls 14 and 15.

In Fig. 5, I show the final pass 6 which is substantially the same as that of the first form, and is formed in the rolls 16 and 17. In this case, the transverse ribs are indicated at 18.

In the final pass in both forms, the metal is entered with its greatest cross-sectional dimension extending vertically, and in this pass all of the longitudinal ribs are completed, and the cross ribs 0, if such are desired. The bar produced is similar to that shown in my copending application, Serial No. 865,931, filed April 2, 1907, except that the bar is curved in cross-section, thus increasing the difiiculty of manufacture by rolling.

The advantages of my invention result from the method of rolling which produces longitudinal ribs with a bar curved in crosssection; and also from the provision for forming cross ribs, if desired.

Many variations may be made in the form and arrangement of the rolls, the passes, the bar produced, etc., without departing from my invention.

I claim 1. The method of rolling ribbed bars consisting in rolling a plain generally rectangular bar between suitable passes to provide an elongated cross section having terminal ribs and rounded end portions, and then reducing the bar by forcing the rounded end portions toward each other and forming supplemental longitudinal ribs between the first named ribs, substantially as described.

2. The method of rolling ribbed bars consisting in rolling a plain generally rectangular bar between suitable passes to provide an elongated cross section having terminal ribs and rounded end portions, and then reducing the bar by forcing the rounded end portions toward each other and forming supplemental longitudinal ribs between the first named ribs, and forming cross ribs connecting saidlongitudinal ribs, substantially as described.

In testimony whereof, I have hereunto set my hand.

THOMAS W. J ENKS.

Witnesses:

LAWRENCE H. LEE, H. M. CoRwrN. 

